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1,904 questions

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Question 461

waec 2007

a body moving at a constant speed accelerates when it is in

Arectilinear motion

Btranslational motion

Ccircular motion

Dvibrational motion

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Question 462

waec 2007

A mass of mass m, experiences a viscous drag, F and an upthrust, U as he descends towards the ground at a steady velocity, Using a parachute. If the acceleration of free fall is g, which of the following expressions is correct?

AFU = mg

BU + F - mg = 0

CU - F = mg

DF - U - mg = 0

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Question 463

waec 2007

Which of the following statements about solid friction are correct? It i. is a force ii. occurs between the surfaces of two bodies in contact iii. depends on the area in contact

Ai and ii only

Bi adnd iii only

Cii and iii only

Di, ii and iii

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Question 464

waec 2007

A liquid of volume 2.00 m3 and density 1.00 x 103 is mixed with 3.00 m3 of another liquid of density 8.00 x 103kg m-3. Calculate the density of the mixture [Assuming there is no chemical reaction]

A5.20 x 10² kg m^-2

B1.13 x 10³ kg m^-3

C8.80 x 10² kg m^-3

D5.20 x 10³ kg m^-3

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Question 465

waec 2007

Which of the following physical quantities is correctly paired with it's corresponding S.I unit?

Adensity[kg m³]

Bpower[Js^-1]

Cspecific latent heat [J kg^-1K^-1

DPressure [Nm^-1]

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Question 466

waec 2007

Which of the following observations is not an effect of surface tension?

Adroplets of water dripping slowly from a tap

Bmercury spilled on a clean glass plate forms spherical droplets

Can indect walking across the surface of a pond

Dwater flowing out more easily then engine oil from a container

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Question 467

waec 2006

Determine the magnitude of P in the diagram above

A16N

B20N

C32N

D40N

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Question 468

waec 2006

The diagram above shows the speed-time graph of a car.If the car covered a total distance of 600m in 25s, calculate its maximum speed

A30ms^-1

B25ms^-1

C20ms^-1

D15ms^-1

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Question 469

waec 2006

An atom \(^{234}_{91} P\) emits a gamma radiation. The resultant nuclide is

A\(^{230}_{90} Th\)

B\(^{234}_{91} Pa\)

C\(^{234}_{90} Th\)

D\(^{234}_{89} Ac\)

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Question 470

waec 2006

Fusion is not usually used for generating electric power because

Ano energy is released when fusion takes place

Bvery high temperatures are required to initiate fusion reaction

Cthe raw materials needed is not easily available

Dheavy nuclei are involved

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Question 471

waec 2006

A radioactive substance of mass 768g has a half life of 3 years. After how many years does this substance leave only 6g undecayed?

A21

B18

C15

D12

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Question 472

waec 2006

A 500kV is applied across an X-ray tube. Calculate the maximum velocity of the electrons produced [Me = 9.1 x 10\(^{-31}\)kg, e = 1.6 x 10\(^{-19}\)C]

A4.2 x 10⁸ms^-1

B1.9 x 10⁸ms^-1

C4.2 x 10⁵ms^-1

D1.8 x 10⁵ms^-1

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Question 473

waec 2006

The breaking up of an atomic nucleus into the fragment of nearly equal size is known as

Anuclear fusion

Bnuclear fission

Cthermonuclear reaction

Dnatural radioactivity

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Question 474

waec 2006

The force experienced by a current-carrying conductor move in a magnetic field is employed in the working of the i. moving coil ammeter ii. electric bell iii. electric motor. Which of the statements above are correct?

Ai and ii only

Bii and iii only

Ci and iii only

Di, ii and iii

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Question 475

waec 2006

Which of the following statements about a bar magnet is correct?

Airon fillings cling uniformly along the length of a bar magnet

Bthe magnetic properties are more pronounced at the middle of a magnet

Cit is impossible to have the same poles at the end of a magnet

Dthe magnetic properties are more pronounced at points near the end of the bar

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Question 476

waec 2006

An electric lamp rated 120W is used on a 240Vrms, calculate the resistance of its filament

A480\(\Omega\)

B360\(\Omega\)

C60\(\Omega\)

D2\(\Omega\)

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Question 477

waec 2006

a cell of e.m.f. 1.5V and internal resistance 1.0\(\Omega\) is connected to two resistor of resistance 2.0\(\Omega\) and 3.0\(\Omega\) in series. Calculate the current through the resistors

A0.25A

B0.30A

C0.35A

D0.50A

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Question 478

waec 2006

The equivalent capacitance of a 3\(\mu F\) capacitor and a 6\(\mu F\) capacitor connected in parallel is

A2.0\(\mu F\)

B3.0\(\mu F\)

C4.5\(\mu F\)

D9.0\(\mu F\)

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Question 479

waec 2006

Which of the following factors does not affect the capacitance of a parallel plate capacitor?

Aarea of the plates

Bnature of the surface of the plates

Cdistance of separation between the plates

Dnature of the insulating material between the plates

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Question 480

waec 2006

An electron of mass m and charge \(\Box\) enters a uniform electric field between two metal plates P and q separated by a distance d. P is maintained at a potential V while Q is earthed. Determine an expression for the magnitude of the acceleration of electron through the field

A\(\frac{eV}{md}\)

B\(\frac{d}{meV}\)

C\(\frac{md}{eV}\)

D\(\frac{e}{Vmd}\)

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